Dialog - Theme attributes to set font

[bsobe]

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Description

• add theme attr to set font

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Checklist:

• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.